Green-blue anthraquinone dye.



Patented November 22, 1904 UNITED STATES PATENT OFFICE.

MAX KUGEL, OF WIESDORF, NEAR COLOGNE, GERMANY, ASSIGNOR TO,

FARBENFABRIKEN OF ELBERFELD (10., OF NEV YORK, N. Y.

GREEN-BLUE ANTHHAQUINONE DYE.

SPECIFICATION forming part of Letters Patent No. 775,369, ed November 22, 1904.

Application filed July 30, 1904. Serial No. 218,877. (No specimens.)

' philosophy, chemist, residing at \Viesdorf,

near Cologne, Germany, (assignor to the FAR- BENFABRIKEN 0E ELBERFELD Co., of New York,) have invented a new and useful Improvement in Anthraquinoue Dyes; and I hereby declare the following to be a clear and exact description of my invention.

My invention relates to the manufacture of l /vhco/ I Br Br In carrying out the process practically I can proceed as follows, the parts being by weight: a mixture of twenty parts of 1-3-dibromo-2- amidoanthraquinone, two hundred parts of nitrobenzene, ten parts of pulverized anhydrous sodium acetate, and one-half part of cupric chlorid (UL1Cl2) is heated to boiling for about five hours while stirring. hen the mass has cooled down to 130 centigrade, the blue needles thus obtained are filtered off, washed with nitrobenzene, alcohol, and hot water.

My new coloring-matter thus obtained is a homogeneous product representing blue needles. It is soluble in hot nitrobenzene and anilin with a greenish-blue color and soluble in concentrated sulfuric acid with an olivebrown color. Upon treatment with hydrosulfite and caustic-soda lye it is transformed into its hydro compound, the alkaline solution of which has the properties of a vat suitable for dyeing and printing unmordanted cotton, pure greenish-blue fast shades being thus obtained.

Having now described my invention and in lll ill what manner the same is to be performed, what I claim as new, and desire to secure byLetters Patent, is

The herein-described new dyestufl being a hydroazin derivative of the anthracene series 5 obtainable by heating 1-3-dibromo-Q-amidoanthraquinone with cupric chlorid and a suitable liq uid,which dyestufl' represents blue needles soluble in hot nitrobenzene and anilin with a greenish-blue and soluble in concentrated sulfuric acid with an olive-brown color; being transformed into a hydro compound on suitable reduction with hydrosullite and causticsoda lye, the alkaline solution thus obtained exhibiting the typical properties of a Vat which dyes unmordanted cotton pure greenishblue shades, substantially as hereinbefore described.

In testimony whereof I have signed my name in the presence of two subscribing witnesses. 5

MAX KUGEL.

\Vitnesses:

J. A. RITTERSHAUS, ALBERT HEMsING. 

